Draft-rigging for cars.



' A. P. PRENDERGASTK; J. J. TATUM.

DRAFT RIGGING FOR CABS. APPLICATION FILED 15017.25, 1907. v

1,002,930; I V Patented se t.12,1911.

v Q 9i Q 21 v S E UNITED STATES PATENT O FI ALOIS P. PRENDERGAST- ANDJOHN J. TATUIM, OE BALTIMORE, MARYLAND.

I DR.A,FT-RIGGING FOR CABS.

Specification of Letters ratenti Patented Sept, 12, 191 1.

Application filed November 25, 1907. Serial N 0. 403,698.

To cllwhoiiait may concern:

Be itknow that We,ALo1s PQPR NDERGAsT I and Joim'iJ, TATUM, both ofBaltimore,

Maryland, have invented a new and useful Improvement in Draft-Riggingfor; Cars, which im'provement is fully set forth in the followingspecification. o

This invention relates .to draft rigging for cars, and more particularlyto the manner.

of uniting the;draw-bar on the coupler to the yoke employed forconnecting said draw bar to the car.

In our Patent No. 887,751, granted Dec. l, 1906,wehave shown aconstruction of thischai'acter in which the draw bar and y the arms ofthe yoke have engaging arcshaped shoulders which alone receive all, thedraft strains between the draw-bar and yoke, with a pin passingvertically through said yoke arms and draw-bar and the axis of saidshoulders, the pin being free from draft strains.

The present invention is designed as an improvementon thestructure ofsaid patent, and particularly with the view of affording greaterflexibility of the parts in a vertical as well as a horizontaldirection.

The invention involves certain features of' construction and combinationof parts which will be hereinafter more specifically described and thenpointed out. in the claims.

While the inven'tiveidea involved is capable of embodiment in a varietyof mechane ical structures, we have'illustrated in the accompanyingdrawings the best embodiment with which we are familiar, in whichdrawings' Figure 1 is a broken vertical section; Fig.

-2 is a sectional plan, the draw-bar head being shown in full lines;Fig. 3 is a broken perspective of the yoke and the draw-bar perspectiveof,

head; and Fig. 4 is a broken the draw-bar headv alone.

Referring to the drawings, in which. like reference numerals indicatecorrespqlldillg parts, 1 is the draw-bar-, 2 is the yoke, the arms ofwhich areconnected by a bridge wall 3 whose face 4 adjacent to thedrawbar head 5 is formedlike the concave surface of a portion of asphere, the outer end 6 of the draw-bar head being formed like theconvex portion of the: surface, of a sphere correspondinghtothe concavesurface 4: of the bridge wall 7, 7 are the draft shoulders, here shownas undercut on the inner faces of the ends of the yokearms, and 8, 8,are corresponding undercutdraft shoulders on the dran= bar head andfacing in the reverse-direction ,to the shoulders 7 on the yoke, saidshoul ders 7 and 8 being a portion of the surface of a sphere whosecenter is in pin 9 passing through an oblong hole 10 formed in thedraw-bar between the head of said drawbar and the couplerhead, said pinserving to prevent the lateral separation-of the yoke andbar, but beingfree from draft strains,

faces of the head'of the draw-bar lying between the armsof the yokeareslightly beveled, as-shown at 11, 11, Fig. 1. It will be seen that bythis construction notonly does the draw-barhead have sufiicientlayto'aiford flexibility of the parts in a horizontal direcnu s. s ne ea y en: h rain is passing around curves, but in addition thereto,thedraw-bar has limited play in a vertical plane such as would occurwhen two cars whose couplers are inslightly different horizontal planesare to be-coupled-together.

By reason of the oblong shape-of the perforation or hole 10, thevertical play of the coupler bar occurs without any strain uponpin 9,and since allthe draft? strains are taken up .by the engagement; of theshoulders 7 and 8 on the yoke and draw-bar: respectively, andthebumping-strains; are taken up between, the spherical surfaces. 4V and 6on.

the,,bridge 3 and the head 5 respectively, it w ll ese n hat th mo tflexib ity tthe parts is. secured without imposing any draft or otherstrains upon the .pin 9, except such as are merely required to preventlateral relative movement between the draw-bar and the yoke such asoccur when the 'parts are to be. disamembled.

What we claim is 1. In a draft rigging for cars, the "combination of adraw-bar having a head whose end forms a portion of the convex surfaceof a sphere, and upwardly and downwardly, projecting shoulders on eitherside of said head, with a yoke whose arms are united by v surface of asphere, with a yoke having in-.

wardly projecting shoulders engaging the shoulders on the draw-bar head,and a bridge wall located between the closed and open ends of said yokeand uniting the arms thereof, the surface of said wall adjacent to thedraw bar head being the concave surface of a portion of a sphere, and apin passing through the. ends of the yoke arms and the perforation inthe draw-bar.

3. In a draft rigging for cars, the combinationof a draw-bar havingoutwardlyprojecting shoulders provided with an. oblong per oration, theend of the draw-bar headforming part of the convex surface of a sphere,whose center is located within said perforation, a yoke having inwardlyprojecting shoulders engaging the shoulders on the draw-bar head andprovided with a bridge wall connecting the arms of the yoke,

the surface of the bridge wall adjacent to the draw'bar head forming apart of the concave surface of a sphere whose center is also withinsaidperforation, and a pin passing through the ends of the yoke-arms andsaid" perforation.

,4. In adraft rigging fon cars, the combination of a draw bar havingoutwardly projecting curved shoulders and an oblong perforation,-the endof the draw-bar-hea-d forming a part of the convex surface of a sphere,

and the draw-bar head being slightly beveled on its upper and lowersurfaces, with a yoke having inwardly projecting curved shouldersengaging the curved shoulders on the draw-bar, the arms of said yokebeing connected by a brid oblong e wall whose surface adjacent to thedrawar head forms a part I of the concave surface of a sphere, and a pinpassing through the ends of the yoke-arms and the perforation inthedraw-bar.

5. In a draft rigging for cars, the combination of a yoke whose arms areconnected by a bridge wall, one .of whose surfaces forms part of aconcave surface of a sphere,

the arms of said yoke being provided with inwardly projecting curvedshoulders, a draw-bar having a longitudinally extending perforation andprovided with a head which latter fits loosely between the arms of saidyoke, and having curved shoulders engaging the said shoulders on theyoke-arm, the end of the draw-bar head forming a part of the convexsurface of a sphere and lying adjacent to the concave spherical surfaceof said bridge wall, and a pin passing through the ends of the. yokearmsand the longitudinally extending oblong perforation in the draw-bar.

6. Ina draft rigging for cars, the combinationof a draw-bar havingupwardly and downwardly projecting shoulders on either side thereof, thesurface of each of said shoulders forniing a part of the surface'of asphere, with a yoke having inwardly projecting spherical shouldersengaging the shoulders on the upper and lower sides re-,

spectively of the draw-bar.

7. In a draft rigging for cars, the combination of a draw-bar having ahead whose end forms a portion of the convex surface of a sphere, andupwardly and lownwardly projecting concave spherical shoulders on eitherside of said head, with a yoke whose arms are united by a bridge wallhaving a face constituting a part of the concave surface of a sphere,said yoke. having inwardly projecting convex spherical shouldersengaging the concave spherical shoulders on the draw-bar head.

In testimony whereof we have signed this specification 1n the presenceof two subscribing witnesses.

ALOIS P. PRENDERGAST. JOHN J. TATUM. Witnesses-.1

. Arum CARRICK, Geo. W. CARRICK.

